Superconducting properties and heat treatment condition on in-situ PIT MgB2 tapes made from Mg flakes

A study on the effect of heat treatment condition on the characteristics of MnO2 added-Fe2TiO5 ceramics for NTC thermistor has been carried out. The ceramics were produced by pressing an homogenous mixture of Fe2O3 (local/ yarosite), TiO2 and MnO2 (2.0 mole %) powders in appropriate proportions to produce Fe2TiO5 based ceramics and sintering the pressed powder at 1050 °C for 3 hours in oxygen gas. Some sintered pellets were heat treated by heating them at 300 °C for 5, 15 and 25 minutes in Ar + 7% H2 gas. The XRD analyses showed that the Fe2TiO5 ceramics with and without heat treatment time had orthorhombic structure. No peak from second phase was observed from the XRD profiles. From the electrical characteristics data, it was known that the heat treatment could change the electrical characteristics of the Fe2TiO5 based-thermistor. The thermistor constant (B) and room temperature resistivity (ρRT) decreased with the increasing of heat treatment time. All ceramics made had thermistor characteristics namely B = 3459-7596 K and ρRT = 1.056-6936.062 MΩcm. Thermistor constant of the ceramics was relatively big, indicated that ceramics made from local iron oxide in this work fit the market requirement for NTC thermistor.

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Surface Modification of the Phosphate Cathode Materials by Control of Heat Treatment Condition

ECS Meeting Abstracts ◽

10.1149/ma2006-01/3/151 ◽

2006 ◽

Keyword(s):

Heat Treatment ◽

Surface Modification ◽

Cathode Materials ◽

Treatment Condition ◽

Heat Treatment Condition

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Transient liquid phase bonding of FSX-414 superalloy at the standard heat treatment condition

Materials Characterization ◽

10.1016/j.matchar.2012.02.002 ◽

2012 ◽

Vol 66 ◽

pp. 38-45 ◽

Cited By ~ 27

Author(s):

R. Bakhtiari ◽

A. Ekrami

Keyword(s):

Heat Treatment ◽

Liquid Phase ◽

Treatment Condition ◽

Transient Liquid Phase ◽

Heat Treatment Condition ◽

Transient Liquid Phase Bonding ◽

Standard Heat Treatment ◽

Standard Heat

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Effect of Post-Weld Heat Treatment on Hardness in Superduplex Stainless Steel ASTM A890/A890M - Grade 6A

Materials Science Forum ◽

10.4028/www.scientific.net/msf.1012.296 ◽

2020 ◽

Vol 1012 ◽

pp. 296-301

Author(s):

Clélia Ribeiro de Oliveira ◽

Eloá Lopes Maia ◽

Solange T. da Fonseca ◽

Marcelo Martins ◽

Julián Arnaldo Ávila Díaz ◽

...

Keyword(s):

Heat Treatment ◽

Stainless Steel ◽

Arc Welding ◽

Treatment Condition ◽

Heat Treatment Condition ◽

Shielded Metal Arc Welding ◽

Metal Arc Welding ◽

Superduplex Stainless Steel ◽

Secondary Austenite ◽

Welding Processes

Superduplex stainless steel alloy exhibit high mechanical and corrosion resistance, which main industrial application is in the petrochemical industry. The manufacture and maintenance of such equipment usually involve welding processes, followed by post-welded heat treatment and it often becomes impossible to apply heat treatments. Thereby, the purpose of this work is to verify the effect of a post-welded heat treatment on shielded metal arc welding in steel grade ASTM A890/A890M - grade 6A. The microstructure in the as-welded condition consisted of austenite, secondary austenite, and ferrite phases and, the post-welded heat treatment condition exhibited only austenite and ferrite. The hardness in the melt zone reached values of 300 HV after welding and, the value was reduced to 260 HV in the post-welded heat treatment condition.

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